{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{c}}
\hline\hline
                    &\multicolumn{1}{c}{\specialcell{As > 10 ppb \\ (household)}}&\multicolumn{1}{c}{\specialcell{As > 50 ppb \\ (household)}}&\multicolumn{1}{c}{\specialcell{As > 10 ppb \\ (water source)}}&\multicolumn{1}{c}{\specialcell{As > 50 ppb \\ (water source)}}\\\cmidrule(lr){2-2}\cmidrule(lr){3-3}\cmidrule(lr){4-4}\cmidrule(lr){5-5}
                    &\multicolumn{1}{c}{(1)}   &\multicolumn{1}{c}{(2)}   &\multicolumn{1}{c}{(3)}   &\multicolumn{1}{c}{(4)}   \\
\hline
Uses any new source &      -0.043   &      -0.013   &      -0.012   &      -0.003   \\
                    &     (0.037)   &     (0.029)   &     (0.037)   &     (0.045)   \\
Treated             &      -0.005   &      -0.000   &      -0.026   &      -0.008   \\
                    &     (0.021)   &     (0.018)   &     (0.023)   &     (0.018)   \\
Treated x uses any new source&      -0.042   &      -0.001   &      -0.109** &      -0.062   \\
                    &     (0.044)   &     (0.035)   &     (0.044)   &     (0.049)   \\
Constant            &      -0.091***&      -0.019   &      -0.066***&      -0.005   \\
                    &     (0.017)   &     (0.015)   &     (0.019)   &     (0.015)   \\
\hline
R$^2$               &        0.02   &        0.02   &        0.04   &        0.04   \\
N                   &        6051   &        6051   &        6051   &        6051   \\
\hline\hline
\end{tabular}
}
